My doc said it was definitely the uterus stretching. Speaking from experience, mine tend to be a lot worse when I haven't been drinking enough. The doctor also suggested walking around whenever it happens if it is particularly painful, but that hasn't helped me at all.

I've been too scared to ask my doctor about it for fear that they'd think I'm stupid or obsessing about things. Does make me feel better to know that it's probably just normal uterus stretching and not something serious. I've noticed it hurts more after I've eaten a meal - I constantly drink water so I'm pretty hydrated most of the time. Walking around...seriously OMG I just want to lay down when it hurts - it's similar to AF cramp type pains. (slight different pain, but similarly painful)

Water, bedrest and mild exercise will definitely help with the cramping! I've had them for weeks and each time I would just drink a liter of water, walk 1-2 miles until I need to pee and then lounge on the sofa listening to peaceful music for an hour or so.